1.

6, 9, 13, 21, 38, 71, ?

Answer»

Answer:

Step-by-step explanation:

Ans:129

1) find difference between two CONTINUOUS no.

2) add odd no. In series

For example..

Difference between 9 and 6 is 3 and first odd no. Is 1 so

9+3=12

12+1=13

Now..for second no. Next odd no. Is 3 so we have to do sum of 3 with 1 i.e. 3+1=4 so

13-9=4 difference

13+4=17+4=11

Remember odd no. Have to add with last adding no.

So.. 9+3=12+1=13. (diff. BET. 6 nd 9 is 3)

13+4=17+4=21. (diff.bet.13 nd 9 is 4 )(1+3=4)

21+8=29+9=38 ( diff.bet.13 nd 21 is8)(4+5=9)

38+17=55+16=71 (diff.bet.38 nd 21 is 17)(9+7=16)

71+33=104+25=129 (diff.bet.38 nd 71 is 33)(16+9=25)


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